We had one of the Valterra adjustable regulators for some time in the past, but it started allowing pressure to build up in the rig. Got a Watts regulator from a Menards near where we were staying, along with adapter fittings for hose connections at both ends. It has been excellent, never exceeding the set pressure. It is a different model than what has already been discussed, but I'm sure it will work as well.
https://www.homedepot.com/p/Watts-3-...M1-U/205073410